keypad enabling with RFID

Projects General Guidance
1

hi, here's my project :

i made a fake bomb with arduino duemilanove , lcd and keypad

what i want to do is adding a RFID reader, locking the keypad when countdown is active, and enabling the keypad with the rfid to enter the code for defusing

problem is that i dont have enough pins left in the arduino ( need 5, got 3)
so would is be possible to wire the rfid on the same pins as the keypad (with a breadboard) to make this works ?

thanks for answers

2

so would is be possible to wire the rfid on the same pins as the keypad (with a breadboard) to make this works ?

It seems unlikely.
Did you know you can use the analogue pins as digital ones.
Then you can add a port expander or shift register to get more I/O pins.